Running HTML/JS site on android phone - javascript

I'm trying to run an HTML5 QR code scanner on an android phone offline. I'm using this library
https://github.com/schmich/instascan
I just copied the below code right from the documentation and it's working like a charm on my computer. When I copy the folder to my android 8 phone, I don't get anything when I open the file with chrome. I should be getting a prompt window to allow camera access but I don't. I tried running an alert() on the page to see if JS is running and it is. I was wondering if there were any other steps to be taken if order for this to work from a local folder on an android smartphone local storage. PS: I also checked to see the permissions manually,they were all set to ask first
<!DOCTYPE html>
<html>
<head>
<title>Instascan</title>
<script type="text/javascript" src="instascan.min.js"></script>
</head>
<body>
<video id="preview"></video>
<script type="text/javascript">
let scanner = new Instascan.Scanner({ video: document.getElementById('preview') });
scanner.addListener('scan', function (content) {
console.log(content);
});
Instascan.Camera.getCameras().then(function (cameras) {
if (cameras.length > 0) {
scanner.start(cameras[0]);
} else {
console.error('No cameras found.');
}
}).catch(function (e) {
console.error(e);
});
</script>
</body>
</html>

Do you add the instascan.min.js to the phone as well? If yes did you add it to the same directory?

Instascan requires a secure connection (HTTPS), so you just need to add https to the url at the beginning to request access to the camera, even if the site does not have the corresponding certificates.

Related

Unable to locate element inside Gmail

I've created a project using Nightwatch.js. The process performs checks in our dev enviroment (which works just fine) and will end up sending a test email to a Gmail account. The process will then go to Gmail, login and click the correct email.
I am attempting to get the URL that was sent to the application (a forgot password link) and sending the browser to the correct URL.
The issue is when I use the following code:
browser
.useXpath()
.getText("string(//*[text()[contains(text(),'RetrievePassword')]])",function(result)
{
console.log(result.log)
})
I get this error:
ERROR: Unable to locate element "" using: xpath
But when I tell Nightwatch to click the link, it will do so with no issue. Any idea?
The URL looks like this:
https://test.website.com/Secure/RetrievePassword.aspx?code=123456789
I think your XPath selector is wrong. If you use //*[contains(text(),'RetrievePassword')] instead, it should work. Here is a basic example:
HTML (index.html)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Nightwatch</title>
</head>
<body>
https://test.website.com/Secure/RetrievePassword.aspx?code=123456789
</body>
</html>
JavaScript (gmail.js)
module.exports = {
'Gmail': function (browser) {
browser
.url('http://localhost:8000/index.html') // Change this if needed
.waitForElementPresent('body', 1000)
.useXpath()
.getText("//*[contains(text(),'RetrievePassword')]", function (res) {
console.log(res.value);
})
.end();
}
};
Command
nightwatch -t tests/gmail.js

Using Cordova webview

I wish to find out, for mobile developing using Cordova, is there a way to open a remote web app, and when a button is click in the remote web app, it execute a java script in Cordova environment?
For example, my mobile app opened up a web page hosted in the app server through web view, to ask the user to acknowledge he read and accept the license. The user need to click "Accept" or "Not Accept" on the web page.
If the user click "Accept", I hope to run a javascript that can bring up another page in the mobile app for the user to proceed to use the mobile app.
Is this possible?
Thanks!
Firstly, it's not a good idea to have a mobile app that is totally reliant on a remote server in order to function properly: what if the user's internet connection cuts out or is intermittent? (that happens plenty where I live).
However, one solution would be use an iframe to load the remote webapp content and cross-frame messaging to communicate the outcome of the UI interactions with the remote webapp back to your Cordova app. You will have to appropriately whitelist your remote webapp URL.
Something like this:
Cordova app index.html
<html>
<head>
<script type="text/javascript" src="cordova.js"></script>
<script type="text/javascript">
function onDeviceReady(){
window.addEventListener("message", onFrameMessage, false);
}
function onFrameMessage(event){
var eventName = event.data[0];
if(eventName === "terms_result"){
var accepted = event.data[1] == 1; // == will match 1 or "1"
if(accepted){
// Do something - e.g. change to homepage
}else{
// Do something else - e.g. display an error message
}
}
}
document.addEventListener("deviceready", onDeviceReady);
</script>
</head>
<body>
<div data-role="page" id="terms">
<iframe src="http://example.com/my/remote/webapp" style="border: 0; width: 100%; height: 100%"></iframe>
</div>
<div data-role="page" id="home">
<!-- Your home page content -->
</div>
</body>
</html>
Remote webapp html
<html>
<head>
<script type="text/javascript">
function accept(result){
window.parent.postMessage(["terms_result", result], "*");
}
</script>
</head>
<body>
<button onclick="accept(1)">Accept</button>
<button onclick="accept(0)">Not Accept</button>
</body>
</html>

SERIALITY() plugin installation on firefox or chrome

Please help me to understand how to install the Seriality Plugin (www.zambetti.com/projects/seriality/‎) in Chrome or Firefox.
I want to read from a COM Port on the client side of a web page.
Take a look at the Google code site, this site contains the DMG file you can use to install the Seriality.plugin file.
https://code.google.com/p/seriality/
You can also see the sample source on the site that shows the javascript to use the plugin, below is a snippet shown on the site that prints "Hello World" to the first port seen on the system at a baudrate of 9600 when this HTML file is loaded.
<html>
<head>
<script type="text/javascript">
function setup()
{
var serial = (document.getElementById("seriality")).Seriality();
serial.begin(serial.ports[0], 9600);
serial.write("Hello World");
}
</script>
</head>
<body onload="setup();">
<object type="application/Seriality" id="seriality" width="0" height="0"></object>
</body>
</html>

Youtube JS API Causes Error in Internet Explorer

I am attempting to embed a Youtube Video inside a webpage. I am using the Youtube Javascript API to embed/load the videos.
My Problem: The video embeds inside Internet Explorer but there are many javascript errors when I inspect the console. These errors mean I cannot replay the video, make the video grow, or really do anything. These javascript errors do not occur in Firefox or Chrome just IE.
Console Error:
SCRIPT87: Invalid Argument.
www-embed-player-vf1m....js line 211 character 405
Heres my JSFiddle that demonstrates the problem. Remember to RUN it in IE to see the problem.
My code:
<html>
<head>
<script src="https://www.youtube.com/player_api" type="text/javascript"></script>
<script type="text/javascript">
function loadYouTubeVideo(uid) {
setTimeout( function() {
var id = uid;
var instPlayer = new YT.Player(id, {
height: '240',
width: '426',
enablejsapi: 1,
suggestedQuality: 'highres',
videoId: uid});
}, 500);
}
</script>
</head>
<body>
<p>Run in IE and look at console</p>
<div id="Go3u2zw6fbE"></div><script> loadYouTubeVideo("Go3u2zw6fbE"); </script>
</body>
<html>
The problem was that I was running the Javascript code from a local HTML file and not from a HTML file over the internet.
I guess when you run the Youtube Javascript API in a local HTML file (inside Internet Explorer only) the youtube video wont play. Even if I click 'Allow Javascript' it still wont play.

How can I detect that a user signed into Facebook?

Here is my scenario. When a user opens a browser and goes to facebook.com to sign himself in, I want to be able to detect that and init my Facebook application sign-in process.
Is that possible? I'm asking because I noticed that signing into Facebook itself doesn't get my app signed in automatically, which is not good.
I'd prefer JavaScript client code.
UPDATE: Here you have a FULLY WORKING example. The only thing you will need to do is to replace the APP_ID for whatever ID you get when sign your app at: http://www.facebook.com/developers/ and the port you may use for the localhost test. This detects when the user logs in even in another browser window. It is obviously extremely basic but proves the point that is feasible with the tools from the graph API.
You can add this code to detect when the user logs in. It is the same oauth log in whether the user clicks on a <fb:login-button> or logs directly onto facebook.com:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Hello App Engine</title>
<SCRIPT type="text/javascript" src="http://connect.facebook.net/en_US/all.js"></SCRIPT>
</head>
<body>
<h1>Hello!</h1>
<div id="fb-root"></div>
<script type="text/javascript">
FB.init({
appId : APP_ID,
status : true, // check login status
cookie : true, // enable cookies to allow the server to access the session
xfbml : true // parse XFBML
});
/*
* Authentication functions
*/
FB.Event.subscribe('auth.login', function (response) {
welcomeMsg(response);
});
FB.Event.subscribe('auth.logout', function (response) {
alert ("Good bye!");
});
if (FB.getSession() != null) {
FB.api('/me', function(response){
console.log(response.name);
welcomeMsg(response);
})
} else {
window.setTimeout(function(){window.location.href="http://localhost:8888"},5000);
}
function welcomeMsg(userData) {
console.log ("Welcome " + userData.name);
}
</script>
</body>
</html>
You can subscribe to the auth.login event.
http://developers.facebook.com/docs/reference/javascript/FB.Event.subscribe/
There are many Facebook images that you can see only if you're logged into Facebook. You can make the user attempt to load one of these images, and then detect if it loaded or not. It's a total trick.

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